The grass is not always greener on the other side!
I have done what a lot of people would dream of doing, left a relatively secure office job with reasonable pay and nice hours to set up a business with my partner. Luckily it worked and we can now afford to employ area managers/managers to run the day to day stuff, leaving me to be able to go back to do the office jobs of the business from home.
Whilst being your own boss and setting your own hours is lovely, do I wish that I could get back to a more social enviroment? You bet! I miss the interaction between other people, not just gossip, but discussing any working issues as well. I am lucky that I can enjoy my own company but also I cannot let off steam with anyone else (but my cat!) or discuss what was on telly the night before! If you work in a team environment and enjoy your job, I think that once you get over the strangeness of being back and upset of leaving your baby, I am sure that you will enjoy the social side/interaction with other people once again. Also I bet your colleagues/friends at work are looking forward to having you back, they probably miss your company.
Best of luck, there is a lot to be said for working with other people!
Sue